DS1501Y Equivalent & Substitute Parts

Part Overview

The DS1501Y is a Real Time Clock (RTC) IC with integrated Clock/Calendar functionality, manufactured by Analog Devices Inc./Maxim Integrated. This 28-DIP parallel interface device provides 256 bytes of NVSRAM with comprehensive timekeeping features including alarm, leap year compensation, square wave output, and watchdog timer capabilities. The DS1501Y is classified as obsolete, making equivalent substitute parts necessary for ongoing system support and new design implementations. Substitute parts must maintain functional compatibility across parallel interface architecture, voltage specifications, and core timekeeping features.

Substiute Parts

DS1501Y

Analog Devices Inc./Maxim IntegratedIn Stock: 1169DS1501Y Datasheet

Current PartRFQ

BQ4802YDW

BenchmarqIn Stock: 1824BQ4802YDW Datasheet

MFR RecommendedRFQ

M48T02-150PC1

STMicroelectronicsIn Stock: 1525M48T02-150PC1 Datasheet

MFR RecommendedRFQ

M48T12-150PC1

STMicroelectronicsIn Stock: 2537M48T12-150PC1 Datasheet

MFR RecommendedRFQ

M48T58-70PC1

STMicroelectronicsIn Stock: 1546M48T58-70PC1 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution logic for the DS1501Y is based on the following critical parameters that determine functional compatibility:

Primary Compatibility Criteria:

• Parallel interface architecture (required for direct pin-level compatibility)
• Supply voltage range overlap with 4.5V ~ 5.5V nominal operation
• 24-hour time format and YY-MM-DD-dd date format support
• Operating temperature range 0°C ~ 70°C
• Through-hole mounting configuration (for mechanical fit in existing PCB layouts)

Substitute Part Categories:

Category 1: Direct Package Equivalent (28-DIP)

• M48T58-70PC1: STMicroelectronics Timekeeper® series, 28-DIP module, parallel interface, matching pin count and physical dimensions

Category 2: Functional Equivalent with Package Variation (24-DIP)

• M48T02-150PC1: STMicroelectronics Timekeeper® series, 24-DIP module, parallel interface, reduced pin count but compatible core functionality
• M48T12-150PC1: STMicroelectronics Timekeeper® series, 24-DIP module, parallel interface, reduced pin count but compatible core functionality

Category 3: Surface Mount Alternative (28-SOIC)

• BQ4802YDW: Benchmarq Clock/Calendar IC, 28-SOIC package, parallel interface, surface mount configuration for alternative PCB assembly methods

All substitute parts maintain parallel interface operation, support 24-hour time format with YY-MM-DD-dd date structure, and operate within the 0°C ~ 70°C temperature range. Voltage supply specifications are compatible with standard 5V logic systems.

Parameter Comparison

Engineering Selection Recommendations

For Direct Pin-Compatible Replacement (Recommended for Existing PCB Layouts): M48T58-70PC1 provides the closest functional and physical match to the DS1501Y. Both devices utilize 28-DIP through-hole packaging with identical physical dimensions (0.600", 15.24mm). The M48T58-70PC1 maintains parallel interface architecture, 24-hour time format, and YY-MM-DD-dd date structure. Supply voltage range (4.75V ~ 5.5V) overlaps with DS1501Y specifications. The M48T58-70PC1 is manufactured by STMicroelectronics under the Timekeeper® series and maintains active product status with ROHS3 compliance.

For Reduced Power Consumption Applications: BQ4802YDW offers significantly lower timekeeping current (1.5mA typical versus 5mA maximum for DS1501Y), making it suitable for battery-backed or low-power applications. The 28-SOIC surface mount package requires PCB redesign but provides improved thermal characteristics and reduced board space. The BQ4802YDW maintains parallel interface operation, 24-hour time format capability, and compatible voltage specifications (4.5V ~ 5.5V). Benchmarq manufacturing and active product status support long-term availability.

For Pin-Count Constrained Designs: M48T02-150PC1 and M48T12-150PC1 provide functional Clock/Calendar operation in 24-DIP through-hole packages, reducing pin count from 28 to 24. Both devices maintain parallel interface, 24-hour time format, and YY-MM-DD-dd date structure. These parts are manufactured by STMicroelectronics under the Timekeeper® series with active product status and ROHS3 compliance. Pin mapping differences require circuit board layout modifications.

Compliance Considerations: All recommended substitute parts maintain ROHS3 compliance and operate within the 0°C ~ 70°C industrial temperature range. STMicroelectronics Timekeeper® series parts (M48T58-70PC1, M48T02-150PC1, M48T12-150PC1) provide established long-term availability and supply chain stability. Active product status across all substitute options ensures continued component availability for production and field service applications.

Frequently Asked Questions (FAQ)

Q: Can M48T02-150PC1 or M48T12-150PC1 directly replace DS1501Y without PCB modification? A: No. The 24-DIP package contains 24 pins versus the DS1501Y's 28-DIP configuration. Pin mapping differences require circuit board layout modifications and schematic verification. These parts are functionally compatible but not pin-compatible.

Q: Is BQ4802YDW suitable for existing DS1501Y PCB layouts? A: No. BQ4802YDW uses 28-SOIC surface mount packaging versus DS1501Y's 28-DIP through-hole configuration. Physical dimensions and mounting methods are incompatible. BQ4802YDW requires PCB redesign for surface mount assembly.

Q: What is the primary advantage of M48T58-70PC1 over other substitutes? A: M48T58-70PC1 maintains identical 28-DIP through-hole packaging and physical dimensions as DS1501Y, enabling direct socket replacement without PCB modification. Both devices support parallel interface, 24-hour time format, and YY-MM-DD-dd date structure.

Q: Are all substitute parts ROHS3 compliant? A: STMicroelectronics Timekeeper® series parts (M48T58-70PC1, M48T02-150PC1, M48T12-150PC1) are ROHS3 compliant. BQ4802YDW compliance status is not specified in available documentation.

Q: What voltage supply range is common across all substitute parts? A: All substitute parts operate within the 4.5V ~ 5.5V supply voltage range, compatible with standard 5V logic systems. M48T58-70PC1, M48T02-150PC1, and M48T12-150PC1 specify minimum 4.75V or 4.5V, ensuring overlap with DS1501Y's 4.5V ~ 5.5V specification.

Q: Which substitute part offers the lowest power consumption? A: BQ4802YDW provides the lowest timekeeping current at 1.5mA typical, compared to DS1501Y's 5mA maximum and M48T series parts' 3mA maximum. This advantage requires surface mount PCB redesign.

Q: Do all substitute parts support 24-hour time format? A: Yes. All substitute parts support HH:MM:SS 24-hour time format and YY-MM-DD-dd date structure, maintaining compatibility with DS1501Y timekeeping architecture.

Q: What is the operating temperature range for substitute parts? A: All substitute parts operate within 0°C ~ 70°C, matching DS1501Y specifications for industrial applications.